# corroded brake booster/leaky brake MC **URL:** \ **Category:** SON240sx Automotive\ **Created:** [May 23, 2007, 8:26pm UTC](https://forums.speedlife.net/t/corroded-brake-booster-leaky-brake-mc/106828 "2007-05-23T20:26:34Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![rmallari](https://avatars.discourse-cdn.com/v4/letter/r/898d66/32.png) [@rmallari](https://forums.speedlife.net/u/rmallari)\ **Post date:** [May 23, 2007, 8:26pm UTC](https://forums.speedlife.net/t/corroded-brake-booster-leaky-brake-mc/106828/1 "2007-05-23T20:26:34Z")
i lose about half the brake fluid in the master cylinder reservoir each month. i changed both the MC and brake booster last year because of the same problem. the paint on the tower/frame under the MC and brake booster is all eaten away and i’d just like to know if the cause is from a faulty master cylinder or brake booster or both. thanks. -Roel ---
**Author:** ![G-E](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/g-e/32/5546_2.png) [@G-E](https://forums.speedlife.net/u/G-E)\ **Post date:** [May 24, 2007, 3:13am UTC](https://forums.speedlife.net/t/corroded-brake-booster-leaky-brake-mc/106828/2 "2007-05-24T03:13:47Z")
> [@got a bike!](https://forums.speedlife.net/t/got-a-bike/12679/17): > > i lose about half the brake fluid in the master cylinder reservoir each month. i changed both the MC and brake booster last year because of the same problem. the paint on the tower/frame under the MC and brake booster is all eaten away and i’d just like to know if the cause is from a faulty master cylinder or brake booster or both. thanks. > > -Roel as with all disappearing fluid… follow the leaks… if there are no leaks that also tells us something… leave a sheet of newspaper under the car held down with tape check the slave cylinder? are the soft lines weeping?, any drips on the driveway? ---
**Author:** ![S13GG](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/s13gg/32/5506_2.png) [@S13GG](https://forums.speedlife.net/u/S13GG)\ **Post date:** [May 24, 2007, 7:54am UTC](https://forums.speedlife.net/t/corroded-brake-booster-leaky-brake-mc/106828/3 "2007-05-24T07:54:31Z")
I’d say check all the fittings, hardlines/flex lines etc look for wetness ---
**Author:** ![rmallari](https://avatars.discourse-cdn.com/v4/letter/r/898d66/32.png) [@rmallari](https://forums.speedlife.net/u/rmallari)\ **Post date:** [May 24, 2007, 8:05am UTC](https://forums.speedlife.net/t/corroded-brake-booster-leaky-brake-mc/106828/4 "2007-05-24T08:05:22Z")
the hard/soft lines are good. it leaks between the master and booster…where the rod is. it eats the paint going down the booster and onto the shock tower/frame. could the seals/o rings be bad on the master? neone rebuild their master b4? ---
**Author:** ![Kick\_Ass\_Matt](https://avatars.discourse-cdn.com/v4/letter/k/ac8455/32.png) [@Kick\_Ass\_Matt](https://forums.speedlife.net/u/Kick_Ass_Matt)\ **Post date:** [May 24, 2007, 8:27am UTC](https://forums.speedlife.net/t/corroded-brake-booster-leaky-brake-mc/106828/5 "2007-05-24T08:27:50Z")
> [@got a bike!](https://forums.speedlife.net/t/got-a-bike/12679/31): > > the hard/soft lines are good. it leaks between the master and booster…where the rod is. it eats the paint going down the booster and onto the shock tower/frame. could the seals/o rings be bad on the master? neone rebuild their master b4? Leak between the input piston rod and seal, common enough. Just get a rebuilt one. ---
**Author:** ![spynn56](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/spynn56/32/5638_2.png) [@spynn56](https://forums.speedlife.net/u/spynn56)\ **Post date:** [May 24, 2007, 10:34am UTC](https://forums.speedlife.net/t/corroded-brake-booster-leaky-brake-mc/106828/6 "2007-05-24T10:34:00Z")
im having the same problem…can you get a rebuild kit for the m/c? or is it better to just find a rebuilt one? ---
**Author:** ![Kick\_Ass\_Matt](https://avatars.discourse-cdn.com/v4/letter/k/ac8455/32.png) [@Kick\_Ass\_Matt](https://forums.speedlife.net/u/Kick_Ass_Matt)\ **Post date:** [May 24, 2007, 12:07pm UTC](https://forums.speedlife.net/t/corroded-brake-booster-leaky-brake-mc/106828/7 "2007-05-24T12:07:34Z")
> [@My old dorm room from college . . .](https://forums.speedlife.net/t/my-old-dorm-room-from-college/12668/9): > > Just get a rebuilt one. . ---
**Author:** ![G-E](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/g-e/32/5546_2.png) [@G-E](https://forums.speedlife.net/u/G-E)\ **Post date:** [May 27, 2007, 4:13pm UTC](https://forums.speedlife.net/t/corroded-brake-booster-leaky-brake-mc/106828/8 "2007-05-27T16:13:07Z")
pm me if you want a low mileage stock abs (2-port) one in great shape